顺层岩质边坡的爆破振动控制标准试验研究

以某顺层岩质路堑开挖爆破为背景，进行了6次层裂爆破试验。测量边坡不同位置处的质点振速并对爆破前后的岩体进行声波探测，然后对振速测量结果和声波速度测量结果进行耦合分析，研究表明：边坡岩体发生爆破层裂后，波速显著降低，岩体的波速降低率随着质点振速增大而增大：质点振速越大，岩体层裂程度越严重，当质点振速小于临界值，岩体不发生层裂：爆破试验所得出的临界振速25．3cm／s可以作为该顺层岩质边坡爆破开挖时的振动控制标准。

TESTING STUDY ON CONTROL STANDARD OF VIBRATION FOR LAYERED ROCK SLOPE BLASTING

Taking the excavation blasting of a layered rock cutting as background,testing study is made for six lamination blasting. The vibration velocities of particles at different positions away from the explosion sources are measured and the rock mass before and after blasting are detected by wave method. Coupling analysis is made on measured results of both vibration velocity and P-wave velocity,The researches show that the wave velocity of rock mass decreases obviously after blast and the decrement rate of wave velocity increases with the particle vibration velocity of slope when the rock mass of slope is of blast-induced lamination. The greater the particle vibration velocity is,the more serious the degree of rock lamination is. When the particle vibration velocity of slope is smaller than a critical value,the lamination of rock mass cant occur. The critical particle vibration velocity is 25.3 cm/s by calculation,which can be used as the control standard of vibration in the layered rock slope blasting.